Dresden 2026 – scientific programme
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DS: Fachverband Dünne Schichten
DS 15: Focus Session: Nickelate Superconductivity: Insights into Unconventional Pairing and Correlation Effects II (joint session TT/DS/MA)
DS 15.9: Talk
Thursday, March 12, 2026, 11:45–12:00, HSZ/0003
Bonding-antibonding s± superconductivity in bilayer nickelates: potential experimental signatures — •Steffen Bötzel, Frank Lechermann, and Ilya Eremin — Ruhr-Universität Bochum, Bochum, Germnay
The discovery of high-Tc superconductivity in Ruddelsden-Popper bilayer nickelates under applied high pressure and/or compressive strain provides a promising platform to study the interplay of multiorbital intralayer and interlayer Cooper-pairing in bilayer systems. In particular, dominant interlayer pairing may naturally lead to a bonding-antibonding s±-gap structure, which directly reflects the bilayer geometry. Such a scenario would produce characteristic experimental signatures that differ from d-wave type gap symmetries. In this contribution, we theoretically address the possible gap structures in bilayer nickelates and discuss how a interlayer-dominated bonding-antibonding s±-gap structure can be potentially distinguished from a d-wave type pairing using experimentally observables.
Keywords: bilayer nickelates; bonding-antibonding superconductivity; interlayer pairing